Phenomenon and Application of Sound Waves

1. A submarine is transmitting a sound wave toward a big rock on the sea bed. State the wave phenomenon involved.

• A Reflection

• B Refraction

• C Dispersion

• D Interferens

What are echoes?

Sounds that are _______ from a hard surface.

• absorbed

• reflected

• propagate

Tick ALL areas where echoes can be heard.

• Cave

• Field

• Tunnel

• A closed hall

__________ is a sound reflection technology applied in ships at sea using the reflection of sound waves to determine the depth of the sea.

• Reflection

• Echo

• Solar

• Sonar

___________ and _________ make use of ultrasound waves to estimate the distance while flying and hunting for prey.

(2 answers)

• bats

• dogs

• birds

• dolphins

The frequency of sound that can be detected by humans is within the range of _________

• 67 Hz to 45 000 Hz

• 16 Hz to 12 000 Hz

• 20 Hz to 20 000 Hz

• 2 000 Hz to 110 000 Hz

Tick the devices to overcome human limitations of hearing

(2 answers)

• Microscopes

• Stethoscopes

• A megaphone

• Periscope

SONAR is a technique or device that used for :

I. detecting objects under water

II. detect cracks in metal structures

III. measure depth of the sea

IV. investigate the abdomen and heart conditions

• I and II

• II and III

• I and III

• I and IV

Ultrasound is a kind of sound wave with its frequency of more than ......

• 50 kHz

• 40 kHz

• 30 kHz

• 20 kHz

Which of the following uses the principle of reflection of sound?

• Sonar

• Hearing aid

• Loudspeaker

• Microscope